Ser. RHoposPERMES. Fam. Cryptonemiacee. 
Prats CCXCVII. 
GIGARTINA DISTICHA, Sox. 
Grn. Cuar. Frond carnoso-cartilaginous, flat or cylindrical, simple or 
variously branched, composed of two strata of cells; the medullary 
stratum, of cylindrical, articulated filaments, anastomosing into a 
vrey lax network; the cortical, of moniliform, vertical, dichotomous 
filaments set in firm gelatine. Fructification: 1, external, globose, 
finally perforate conceptacles, containing within a saccate placenta (?) 
formed of closely interwoven filaments, a compound nucleus consist- 
ing of many confluent wcleoli, or masses of roundish-angular spores; 
2, cruciate ¢etraspores, collected into dense, subprominent sori, lodged 
beneath the superficial cells —Giearrina (Lamour.), from yuyaptor, 
a grape-stone, which the conceptacles resemble. 
Frons carnoso-cartilaginea, plana v. cylindracea, ramosa, ex stratis duobus 
cellularum composita; stratum medullare ex filis tenuibus cylindraceis laxe 
anastomosantibus, corticale ex filis moniliformibus verticalibus dichotomis 
Sormatum. Fruct.: 1, favellidia intra pericarpium externum carpostomio 
pertusum excepta, filis arachnoiders intertextis obroluta; 2, tetraspore cru- 
ciatim divise, im soros subprominentes infra stratum corticale nidulantes 
plurime collecte. 
Gieartina disticha ; frond strongly compressed, thick, linear, pinnately 
decompound, pinneedistichous, often few and irregular, pinnules cylin- 
drical, obtuse, simple or forked, spreading ; cystocarps solitary in the 
tips of the pinnules; sori elongate, immersed in the pinnules. 
G. disticha; fronde compresso-plana crassa lineari pinnatim decomposita, pinnis 
distichis conformibus sepius paucis et vagis, pinnulis cylindraceis obtusis sim- 
plicibus et furcatis patentibus, cystocarpiis in apicibus pinnularum, soris elon- 
gatis infra apices tmmersis. 
GiGaRTINa disticha, Sond. Bot. Zeit. 1845, p. 55. Sond. in Pl. Preiss. v. 2. 
p. 115. J. Ag. Sp. Alg. v. 2. p. 269. Harv. Alg. Exsice. Austr. n. 400. 
Has. Swan River, Preiss! Milne! W.H. H. 
Grocr. Distr. Western Australia. 
Descr. foot an expanded, fleshy disc, an inch or more in diameter. Fronds 
many from the same base, 8-12 inches long, distichously much divided in 
a more or less pinnate manner ; the main stem either quite simple or dividing 
into two or more principal branches, more or less strongly compressed, as are 
also the primary and secondary branches. Pinne sometimes few and irre- 
gular, sometimes numerous and rather closely set, either alternate or sub- 
opposite, widely and often horizontally spreading, pinnulated for their whole 
length, or in the upper part only, 2-3 lines wide, compressed or subterete. 
